Channel sounding for wireless local area network sensing

Abstract

This disclosure describes systems, methods, and devices related to WLAN sensing sounding. A device may identify a sensing null data packet (NDP) request frame received from a second device, the sensing NDP request frame associated with performing a wireless local area network channel sounding procedure; identify transmit parameters included in a transmit control field of the sensing NDP request frame; generate an NDP frame using the transmit parameters; and send, in response to the sensing NDP request frame, the NDP frame to the second device.

What is claimed is: 
     
         1 . A device comprising processing circuitry coupled to non transitory storage, the processing circuitry configured to:
 identify a sensing request received from a second device, wherein the sensing request signals sensing parameters comprising a number of spatial streams, a transmission power, and a channel bandwidth;   generate, based on the sensing parameters, a sensing null data packet to transmit, wherein the sensing null data packet is associated with detecting an object or motion;   generate a spatial mapping matrix for the sensing null data packet;   map space-time streams to transmit chains based on the spatial mapping matrix; and   cause transmission of the sensing null data packet to the second device based on the mapping.   
     
     
         2 . The device of  claim 1 , wherein the device is an access point that initiated a sounding procedure, and wherein the second device is a station device. 
     
     
         3 . The device of  claim 2 , wherein the sensing null data packet is transmitted after a null data packet announcement transmission during a null data packet announcement sounding phase. 
     
     
         4 . The device of  claim 1 , wherein the spatial mapping matrix is an identity matrix. 
     
     
         5 . The device of  claim 1 , wherein the device is a station device that initiated a sounding procedure, and wherein the second device is an access point. 
     
     
         6 . The device of  claim 5 , wherein the sensing null data packet is transmitted after a null data packet announcement transmission during a measurement sounding phase. 
     
     
         7 . The device of  claim 1 , further comprising a transceiver configured to transmit and receive wireless signals comprising the sensing null data packet. 
     
     
         8 . The device of  claim 7 , further comprising an antenna coupled to the transceiver to send the sensing null data packet. 
     
     
         9 . A non-transitory computer-readable medium storing computer-executable instructions which when executed by one or more processors of a device result in performing operations comprising:
 identifying a sensing request received from a second device, wherein the sensing request signals sensing parameters comprising a number of spatial streams, a transmission power, and a channel bandwidth;   generating, based on the sensing parameters, a sensing null data packet to transmit, wherein the sensing null data packet is associated with detecting an object or motion;   generating a spatial mapping matrix for the sensing null data packet;   mapping space-time streams to transmit chains based on the spatial mapping matrix; and   causing transmission of the sensing null data packet to the second device based on the mapping.   
     
     
         10 . The non-transitory computer-readable medium of  claim 9 , wherein the device is an access point that initiated a sounding procedure, and wherein the second device is a station device. 
     
     
         11 . The non-transitory computer-readable medium of  claim 10 , wherein the sensing null data packet is transmitted after a null data packet announcement transmission during a null data packet announcement sounding phase. 
     
     
         12 . The non-transitory computer-readable medium of  claim 9 , wherein the spatial mapping matrix is an identity matrix. 
     
     
         13 . The non-transitory computer-readable medium of  claim 9 , wherein the device is a station device that initiated a sounding procedure, and wherein the second device is an access point. 
     
     
         14 . The non-transitory computer-readable medium of  claim 13 , wherein the sensing null data packet is transmitted after a null data packet announcement transmission during a measurement sounding phase. 
     
     
         15 . A method comprising:
 identifying, by processing circuitry of a first device, a sensing request received from a second device, wherein the sensing request signals sensing parameters comprising a number of spatial streams, a transmission power, and a channel bandwidth;   generating, by the processing circuitry and based on the sensing parameters, a sensing null data packet to transmit, wherein the sensing null data packet is associated with detecting an object or motion;   generating, by the processing circuitry, a spatial mapping matrix for the sensing null data packet;   mapping, by the processing circuitry, space-time streams to transmit chains based on the spatial mapping matrix; and   causing transmission, by the processing circuitry, of the sensing null data packet to the second device based on the mapping.   
     
     
         16 . The method of  claim 15 , wherein the device is an access point that initiated a sounding procedure, and wherein the second device is a station device. 
     
     
         17 . The method of  claim 16 , wherein the sensing null data packet is transmitted after a null data packet announcement transmission during a null data packet announcement sounding phase. 
     
     
         18 . The method of  claim 15 , wherein the spatial mapping matrix is an identity matrix. 
     
     
         19 . The method of  claim 15 , wherein the device is a station device that initiated a sounding procedure, and wherein the second device is an access point. 
     
     
         20 . The method of  claim 19 , wherein the sensing null data packet is transmitted after a null data packet announcement transmission during a measurement sounding phase.